YOU SAID:
Potato Fiona is a potato
INTO JAPANESE
じゃがいもフィオナはじゃがいも
BACK INTO ENGLISH
Potato and Fiona are potatoes
INTO JAPANESE
じゃがいもとフィオナはじゃがいも
BACK INTO ENGLISH
Potato and Fiona are potatoes
That didn't even make that much sense in English.